Phenolic imidazolones and polymers stabilized therewith

Abstract

Compounds of the formula I ##STR1## wherein A is 1,2-cycloalkylene, 1,2-cycloalkenylene or 1,2-arylene, R 1 and R 2 are alkyl, R 3 , R 4 and R 5 are hydrogen or alkyl and n is 0, 1 or 2, as stabilizers for organic material.

What we claim is: 
     
       1. Compounds of the formula I ##STR5## wherein A is 1,2-cycloalkylene, 1,2-cycloalkenylene or 1,2-arylene, R 1  and R 2  are alkyl, R 3 , R 4  and R 5  are hydrogen or alkyl and n is 0, 1 or 2. 
     
     
       2. Compound according to claim 1, wherein A is 1,2-cyclopentylene, 1,2-cyclohexylene, 1,2-cyclohex-1-enylene or 1,2-phenylene, R 1  and R 2  are alkyl with 1-8 C atoms, R 3 , R 4  and R 5  are hydrogen and n is 0, 1 or 2. 
     
     
       3. Compound according to claim 1, wherein A is 1,2-phenylene or 1,2-cyclohex-1-enylene, R 1  and R 2  are α-branched alkyl with 3-8 C atoms, R 3 , R 4  and R 5  are hydrogen and n is 0, 1 or 2. 
     
     
       4. Compound according to claim 1, wherein n is 2. 
     
     
       5. Compound according to claim 1, that is to say 1,3-di-[3-3,5-di-tert.butyl-4-hydroxy-phenyl)-propionyloxyethyl]-benzimidazol-2-one. 
     
     
       6. Compound according to claim 1, that is to say 1,3-di-[3-(3,5-di-tert.-butyl-4-hydroxy-phenyl)-propionyloxyethyl]-4,5,6,7-tetrahydro-benzimidazol-2-one. 
     
     
       7. Synthetic organic polymer containing a compound according to claim 1. 
     
     
       8. The composition of claim 7 wherein the organic polymer is polyolefin. 
     
     
       9. The composition of claim 8 wherein the polyolefin is polypropylene.